Jawapan

2015-09-04T22:07:08+08:00
2800mm³÷42mm
=66.66666667mm²
=66.667mm²
2015-09-04T23:20:22+08:00
Isipadu piramid =  \frac{1}{3} (Luas) (Tinggi)

Luas tapak piramid
= 2800 X 3 ÷ 42
= 200mm^{2}